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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="dir_66e9674e8206a335795995fa32a03c91.html">entt</a></li><li class="navelem"><a class="el" href="dir_a53318306f6ac0f7fe657839abd543ab.html">signal</a></li> </ul>
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<div class="title">delegate.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef ENTT_SIGNAL_DELEGATE_HPP</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define ENTT_SIGNAL_DELEGATE_HPP</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>  </div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>  </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <tuple></span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <cstddef></span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <utility></span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <functional></span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <type_traits></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "../config/config.h"</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span><a class="code" href="namespaceentt.html">entt</a> {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span>internal {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">auto</span> function_pointer(Ret(*)(Args...)) -> Ret(*)(Args...);</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span> Type, <span class="keyword">typename</span>... Args, <span class="keyword">typename</span> Other></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">auto</span> function_pointer(Ret(*)(Type, Args...), Other &&) -> Ret(*)(Args...);</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  </div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">template</span><<span class="keyword">typename</span> Class, <span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args, <span class="keyword">typename</span>... Other></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">auto</span> function_pointer(Ret(Class:: *)(Args...), Other &&...) -> Ret(*)(Args...);</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">template</span><<span class="keyword">typename</span> Class, <span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args, <span class="keyword">typename</span>... Other></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">auto</span> function_pointer(Ret(Class:: *)(Args...) <span class="keyword">const</span>, Other &&...) -> Ret(*)(Args...);</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">template</span><<span class="keyword">typename</span> Class, <span class="keyword">typename</span> Type, <span class="keyword">typename</span>... Other></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">auto</span> function_pointer(Type Class:: *, Other &&...) -> Type(*)();</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="keyword">template</span><<span class="keyword">typename</span>... Type></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">using</span> function_pointer_t = decltype(internal::function_pointer(std::declval<Type>()...));</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">template</span><<span class="keyword">typename</span>... Class, <span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> constexpr <span class="keyword">auto</span> index_sequence_for(Ret(*)(Args...)) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> std::index_sequence_for<Class..., Args...>{};</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> }</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> }</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keyword">template</span><auto></div>
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<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structentt_1_1connect__arg__t.html"> 66</a></span> <span class="keyword">struct </span><a class="code" href="structentt_1_1connect__arg__t.html">connect_arg_t</a> {};</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">template</span><auto Func></div>
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<div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="namespaceentt.html#af1e73acd6f3d892955819677dc2664b7"> 71</a></span> constexpr <a class="code" href="structentt_1_1connect__arg__t.html">connect_arg_t<Func></a> <a class="code" href="namespaceentt.html#af1e73acd6f3d892955819677dc2664b7">connect_arg</a>{};</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">template</span><<span class="keyword">typename</span>></div>
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<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="classentt_1_1delegate.html"> 81</a></span> <span class="keyword">class </span><a class="code" href="classentt_1_1delegate.html">delegate</a>;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html"> 97</a></span> <span class="keyword">class </span><a class="code" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> {</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">using</span> proto_fn_type = Ret(<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args...);</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keyword">template</span><<span class="keyword">auto</span> Candidate, std::size_t... Index></div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">auto</span> wrap(std::index_sequence<Index...>) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> [](<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args... args) -> Ret {</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">const</span> <span class="keyword">auto</span> arguments = std::forward_as_tuple(std::forward<Args>(args)...);</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> Ret(std::invoke(Candidate, std::forward<std::tuple_element_t<Index, std::tuple<Args...>>>(std::get<Index>(arguments))...));</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  };</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keyword">template</span><<span class="keyword">auto</span> Candidate, <span class="keyword">typename</span> Type, std::size_t... Index></div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">auto</span> wrap(Type &, std::index_sequence<Index...>) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> Ret {</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">const</span> <span class="keyword">auto</span> arguments = std::forward_as_tuple(std::forward<Args>(args)...);</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  Type *curr = static_cast<Type *>(<span class="keyword">const_cast<</span>std::conditional_t<std::is_const_v<Type>, <span class="keyword">const </span><span class="keywordtype">void</span> *, <span class="keywordtype">void</span> *<span class="keyword">></span>>(payload));</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">return</span> Ret(std::invoke(Candidate, *curr, std::forward<std::tuple_element_t<Index, std::tuple<Args...>>>(std::get<Index>(arguments))...));</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  };</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  }</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  </div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">template</span><<span class="keyword">auto</span> Candidate, <span class="keyword">typename</span> Type, std::size_t... Index></div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">auto</span> wrap(Type *, std::index_sequence<Index...>) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">return</span> [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> Ret {</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">const</span> <span class="keyword">auto</span> arguments = std::forward_as_tuple(std::forward<Args>(args)...);</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  Type *curr = static_cast<Type *>(<span class="keyword">const_cast<</span>std::conditional_t<std::is_const_v<Type>, <span class="keyword">const </span><span class="keywordtype">void</span> *, <span class="keywordtype">void</span> *<span class="keyword">></span>>(payload));</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">return</span> Ret(std::invoke(Candidate, curr, std::forward<std::tuple_element_t<Index, std::tuple<Args...>>>(std::get<Index>(arguments))...));</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  };</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  }</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  </div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a235927a00f56e4b56dbfdc4e6cf5ddb4"> 128</a></span>  <span class="keyword">using</span> <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a235927a00f56e4b56dbfdc4e6cf5ddb4">function_type</a> = Ret(Args...);</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  </div>
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<div class="line"><a name="l00131"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a5c4828a5df5ed1e8fd18465ff63eb73c"> 131</a></span>  <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a5c4828a5df5ed1e8fd18465ff63eb73c">delegate</a>() ENTT_NOEXCEPT</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  : fn{<span class="keyword">nullptr</span>}, data{<span class="keyword">nullptr</span>}</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  {}</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  </div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate></div>
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<div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#af4f480038e4c18d1ad106af3b26574da"> 141</a></span>  <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#af4f480038e4c18d1ad106af3b26574da">delegate</a>(<a class="code" href="structentt_1_1connect__arg__t.html">connect_arg_t<Candidate></a>) ENTT_NOEXCEPT</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  : <a class="code" href="classentt_1_1delegate.html">delegate</a>{}</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  {</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  connect<Candidate>();</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  </div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a name="l00155"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a3f4b93ddb413740d3a06b223202dc7f5"> 155</a></span>  <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a3f4b93ddb413740d3a06b223202dc7f5">delegate</a>(<a class="code" href="structentt_1_1connect__arg__t.html">connect_arg_t<Candidate></a>, Type &&value_or_instance) ENTT_NOEXCEPT</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  : <a class="code" href="classentt_1_1delegate.html">delegate</a>{}</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  {</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  connect<Candidate>(std::forward<Type>(value_or_instance));</div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  }</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  </div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate></div>
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<div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a6e732abcbc4aa9b8899c92d8f21e55a6"> 166</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a6e732abcbc4aa9b8899c92d8f21e55a6">connect</a>() ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  data = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  </div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> constexpr(std::is_invocable_r_v<Ret, decltype(Candidate), Args...>) {</div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  fn = [](<span class="keyword">const</span> <span class="keywordtype">void</span> *, Args... args) -> Ret {</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">return</span> Ret(std::invoke(Candidate, std::forward<Args>(args)...));</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  };</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> constexpr(std::is_member_pointer_v<decltype(Candidate)>) {</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  fn = wrap<Candidate>(internal::index_sequence_for<std::tuple_element_t<0, std::tuple<Args...>>>(internal::function_pointer_t<decltype(Candidate)>{}));</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  fn = wrap<Candidate>(internal::index_sequence_for(internal::function_pointer_t<decltype(Candidate)>{}));</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  }</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  </div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a name="l00196"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#aae828d209ffe33590c2bb8e4b37f47ef"> 196</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#aae828d209ffe33590c2bb8e4b37f47ef">connect</a>(Type &value_or_instance) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  data = &value_or_instance;</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  </div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> constexpr(std::is_invocable_r_v<Ret, decltype(Candidate), Type &, Args...>) {</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  fn = [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> Ret {</div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  Type *curr = static_cast<Type *>(<span class="keyword">const_cast<</span>std::conditional_t<std::is_const_v<Type>, <span class="keyword">const </span><span class="keywordtype">void</span> *, <span class="keywordtype">void</span> *<span class="keyword">></span>>(payload));</div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">return</span> Ret(std::invoke(Candidate, *curr, std::forward<Args>(args)...));</div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  };</div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  fn = wrap<Candidate>(value_or_instance, internal::index_sequence_for(internal::function_pointer_t<decltype(Candidate), Type>{}));</div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  }</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  </div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a name="l00220"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#afcdce5ab5ae55520cce86f3f79b38e9c"> 220</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#afcdce5ab5ae55520cce86f3f79b38e9c">connect</a>(Type *value_or_instance) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  data = value_or_instance;</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  </div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">if</span> constexpr(std::is_invocable_r_v<Ret, decltype(Candidate), Type *, Args...>) {</div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  fn = [](<span class="keyword">const</span> <span class="keywordtype">void</span> *payload, Args... args) -> Ret {</div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  Type *curr = static_cast<Type *>(<span class="keyword">const_cast<</span>std::conditional_t<std::is_const_v<Type>, <span class="keyword">const </span><span class="keywordtype">void</span> *, <span class="keywordtype">void</span> *<span class="keyword">></span>>(payload));</div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordflow">return</span> Ret(std::invoke(Candidate, curr, std::forward<Args>(args)...));</div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  };</div>
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<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  fn = wrap<Candidate>(value_or_instance, internal::index_sequence_for(internal::function_pointer_t<decltype(Candidate), Type>{}));</div>
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<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  }</div>
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  }</div>
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<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  </div>
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<div class="line"><a name="l00238"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a0d81bb1bde6abd78914cd0a07084bcd7"> 238</a></span>  <span class="keywordtype">void</span> <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a0d81bb1bde6abd78914cd0a07084bcd7">reset</a>() ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  fn = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  data = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  }</div>
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<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  </div>
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<div class="line"><a name="l00247"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a3e0495b7612d458cbc59dc4b657d586f"> 247</a></span>  <span class="keyword">const</span> <span class="keywordtype">void</span> * <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a3e0495b7612d458cbc59dc4b657d586f">instance</a>() const ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordflow">return</span> data;</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  }</div>
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<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  </div>
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<div class="line"><a name="l00265"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a0e53caedb53810bc96aa71bce199c990"> 265</a></span>  Ret <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a0e53caedb53810bc96aa71bce199c990">operator()</a>(Args... args)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  ENTT_ASSERT(fn);</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">return</span> fn(data, std::forward<Args>(args)...);</div>
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<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  }</div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  </div>
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<div class="line"><a name="l00274"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a73e1029cbb6359d803a6cc06b82f80d7"> 274</a></span>  <span class="keyword">explicit</span> <span class="keyword">operator</span> bool() const ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">// no need to test also data</span></div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">return</span> !(fn == <span class="keyword">nullptr</span>);</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  }</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  </div>
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<div class="line"><a name="l00284"></a><span class="lineno"><a class="line" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a54ca30c9a3f7a9662363c48db4e86aae"> 284</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a54ca30c9a3f7a9662363c48db4e86aae">operator==</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> &other) <span class="keyword">const</span> ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">return</span> fn == other.fn && data == other.data;</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  }</div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  </div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  proto_fn_type *fn;</div>
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keyword">const</span> <span class="keywordtype">void</span> *data;</div>
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> };</div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  </div>
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  </div>
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="keyword">template</span><<span class="keyword">typename</span> Ret, <span class="keyword">typename</span>... Args></div>
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<div class="line"><a name="l00303"></a><span class="lineno"><a class="line" href="namespaceentt.html#a656b2ec80abf493ce1924b314d13fd18"> 303</a></span> <span class="keywordtype">bool</span> <a class="code" href="namespaceentt.html#a1a211752d12273a08015c524133e27c3">operator!=</a>(<span class="keyword">const</span> <a class="code" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> &lhs, <span class="keyword">const</span> <a class="code" href="classentt_1_1delegate.html">delegate</a><Ret(Args...)> &rhs) ENTT_NOEXCEPT {</div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">return</span> !(lhs == rhs);</div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> }</div>
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  </div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  </div>
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<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate></div>
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <a class="code" href="namespaceentt.html#a40a1dbbb903a3a90b4aa59250a9a68ed">delegate</a>(connect_arg_t<Candidate>) ENTT_NOEXCEPT</div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> -> <a class="code" href="namespaceentt.html#a40a1dbbb903a3a90b4aa59250a9a68ed">delegate</a><std::remove_pointer_t<internal::function_pointer_t<decltype(Candidate)>>>;</div>
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  </div>
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<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  </div>
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<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="keyword">template</span><auto Cand<span class="keywordtype">id</span>ate, <span class="keyword">typename</span> Type></div>
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<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <a class="code" href="namespaceentt.html#a40a1dbbb903a3a90b4aa59250a9a68ed">delegate</a>(connect_arg_t<Candidate>, Type &&) ENTT_NOEXCEPT</div>
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<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> -> <a class="code" href="namespaceentt.html#a40a1dbbb903a3a90b4aa59250a9a68ed">delegate</a><std::remove_pointer_t<internal::function_pointer_t<decltype(Candidate), Type>>>;</div>
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<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  </div>
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<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  </div>
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<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> }</div>
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<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  </div>
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<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  </div>
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<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="preprocessor">#endif</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a0d81bb1bde6abd78914cd0a07084bcd7"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a0d81bb1bde6abd78914cd0a07084bcd7">entt::delegate< Ret(Args...)>::reset</a></div><div class="ttdeci">void reset() ENTT_NOEXCEPT</div><div class="ttdoc">Resets a delegate.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00238">delegate.hpp:238</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_aae828d209ffe33590c2bb8e4b37f47ef"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#aae828d209ffe33590c2bb8e4b37f47ef">entt::delegate< Ret(Args...)>::connect</a></div><div class="ttdeci">void connect(Type &value_or_instance) ENTT_NOEXCEPT</div><div class="ttdoc">Connects a free function with payload or a bound member to a delegate.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00196">delegate.hpp:196</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a0e53caedb53810bc96aa71bce199c990"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a0e53caedb53810bc96aa71bce199c990">entt::delegate< Ret(Args...)>::operator()</a></div><div class="ttdeci">Ret operator()(Args... args) const</div><div class="ttdoc">Triggers a delegate.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00265">delegate.hpp:265</a></div></div>
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<div class="ttc" id="anamespaceentt_html_af1e73acd6f3d892955819677dc2664b7"><div class="ttname"><a href="namespaceentt.html#af1e73acd6f3d892955819677dc2664b7">entt::connect_arg</a></div><div class="ttdeci">constexpr connect_arg_t< Func > connect_arg</div><div class="ttdoc">Constant of type connect_arg_t used to disambiguate calls.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00071">delegate.hpp:71</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a40a1dbbb903a3a90b4aa59250a9a68ed"><div class="ttname"><a href="namespaceentt.html#a40a1dbbb903a3a90b4aa59250a9a68ed">entt::delegate</a></div><div class="ttdeci">delegate(connect_arg_t< Candidate >) ENTT_NOEXCEPT -> delegate< std::remove_pointer_t< internal::function_pointer_t< decltype(Candidate)>>></div><div class="ttdoc">Deduction guide.</div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a5c4828a5df5ed1e8fd18465ff63eb73c"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a5c4828a5df5ed1e8fd18465ff63eb73c">entt::delegate< Ret(Args...)>::delegate</a></div><div class="ttdeci">delegate() ENTT_NOEXCEPT</div><div class="ttdoc">Default constructor.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00131">delegate.hpp:131</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a6e732abcbc4aa9b8899c92d8f21e55a6"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a6e732abcbc4aa9b8899c92d8f21e55a6">entt::delegate< Ret(Args...)>::connect</a></div><div class="ttdeci">void connect() ENTT_NOEXCEPT</div><div class="ttdoc">Connects a free function or an unbound member to a delegate.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00166">delegate.hpp:166</a></div></div>
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<div class="ttc" id="anamespaceentt_html"><div class="ttname"><a href="namespaceentt.html">entt</a></div><div class="ttdoc">EnTT default namespace.</div><div class="ttdef"><b>Definition:</b> <a href="algorithm_8hpp_source.html#l00013">algorithm.hpp:13</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a235927a00f56e4b56dbfdc4e6cf5ddb4"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a235927a00f56e4b56dbfdc4e6cf5ddb4">entt::delegate< Ret(Args...)>::function_type</a></div><div class="ttdeci">Ret(Args...) function_type</div><div class="ttdoc">Function type of the delegate.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00128">delegate.hpp:128</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a3e0495b7612d458cbc59dc4b657d586f"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a3e0495b7612d458cbc59dc4b657d586f">entt::delegate< Ret(Args...)>::instance</a></div><div class="ttdeci">const void * instance() const ENTT_NOEXCEPT</div><div class="ttdoc">Returns the instance or the payload linked to a delegate, if any.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00247">delegate.hpp:247</a></div></div>
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<div class="ttc" id="anamespaceentt_html_a1a211752d12273a08015c524133e27c3"><div class="ttname"><a href="namespaceentt.html#a1a211752d12273a08015c524133e27c3">entt::operator!=</a></div><div class="ttdeci">constexpr bool operator!=(const basic_hashed_string< Char > &lhs, const basic_hashed_string< Char > &rhs) ENTT_NOEXCEPT</div><div class="ttdoc">Compares two hashed strings.</div><div class="ttdef"><b>Definition:</b> <a href="hashed__string_8hpp_source.html#l00226">hashed_string.hpp:226</a></div></div>
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<div class="ttc" id="astructentt_1_1connect__arg__t_html"><div class="ttname"><a href="structentt_1_1connect__arg__t.html">entt::connect_arg_t</a></div><div class="ttdoc">Used to wrap a function or a member of a specified type.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00066">delegate.hpp:66</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a3f4b93ddb413740d3a06b223202dc7f5"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a3f4b93ddb413740d3a06b223202dc7f5">entt::delegate< Ret(Args...)>::delegate</a></div><div class="ttdeci">delegate(connect_arg_t< Candidate >, Type &&value_or_instance) ENTT_NOEXCEPT</div><div class="ttdoc">Constructs a delegate and connects a free function with payload or a bound member.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00155">delegate.hpp:155</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_html"><div class="ttname"><a href="classentt_1_1delegate.html">entt::delegate</a></div><div class="ttdoc">Basic delegate implementation.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00081">delegate.hpp:81</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_af4f480038e4c18d1ad106af3b26574da"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#af4f480038e4c18d1ad106af3b26574da">entt::delegate< Ret(Args...)>::delegate</a></div><div class="ttdeci">delegate(connect_arg_t< Candidate >) ENTT_NOEXCEPT</div><div class="ttdoc">Constructs a delegate and connects a free function or an unbound member.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00141">delegate.hpp:141</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_a54ca30c9a3f7a9662363c48db4e86aae"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#a54ca30c9a3f7a9662363c48db4e86aae">entt::delegate< Ret(Args...)>::operator==</a></div><div class="ttdeci">bool operator==(const delegate< Ret(Args...)> &other) const ENTT_NOEXCEPT</div><div class="ttdoc">Compares the contents of two delegates.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00284">delegate.hpp:284</a></div></div>
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<div class="ttc" id="aclassentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4_html_afcdce5ab5ae55520cce86f3f79b38e9c"><div class="ttname"><a href="classentt_1_1delegate_3_01Ret_07Args_8_8_8_08_4.html#afcdce5ab5ae55520cce86f3f79b38e9c">entt::delegate< Ret(Args...)>::connect</a></div><div class="ttdeci">void connect(Type *value_or_instance) ENTT_NOEXCEPT</div><div class="ttdoc">Connects a free function with payload or a bound member to a delegate.</div><div class="ttdef"><b>Definition:</b> <a href="delegate_8hpp_source.html#l00220">delegate.hpp:220</a></div></div>
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